MidInfrared QuantumDot Quantum Cascade Laser: A Theoretical Feasibility Study
In the framework of a microscopic model for intersubband gain from electrically pumped quantumdot structures we investigate electrically pumped quantumdots as active material for a midinfrared quantum cascade laser. Our previous calculations have indicated that these structures could operate with reduced threshold current densities while also achieving a modal gain comparable to that of quantum well active materials. We study the influence of two important quantumdot material parameters, here, namely inhomogeneous broadening and quantumdot sheet density, on the performance of a proposed quantum cascade laser design. In terms of achieving a positive modal net gain, a high quantumdot density can compensate for moderately high inhomogeneous broadening, but at a cost of increased threshold current density. By minimizing quantumdot density with presently achievable inhomogeneous broadening and total losses, significantly lower threshold densities than those reported in quantumwell quantumcascade lasers are predicted by our theory.
 Authors:

^{[1]};
^{[2]};
^{[1]}
 Univ. of Kaiserslautern (Germany)
 Sandia National Lab. (SNLNM), Albuquerque, NM (United States)
 Publication Date:
 Report Number(s):
 SAND20164834J
Journal ID: ISSN 23046732; 640623
 Grant/Contract Number:
 AC0494AL85000
 Type:
 Accepted Manuscript
 Journal Name:
 Photonics
 Additional Journal Information:
 Journal Volume: 3; Journal Issue: 2; Journal ID: ISSN 23046732
 Research Org:
 Sandia National Lab. (SNLNM), Albuquerque, NM (United States)
 Sponsoring Org:
 USDOE National Nuclear Security Administration (NNSA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
 OSTI Identifier:
 1257807
Michael, Stephan, Chow, Weng, and Schneider, Hans. MidInfrared QuantumDot Quantum Cascade Laser: A Theoretical Feasibility Study. United States: N. p.,
Web. doi:10.3390/photonics3020029.
Michael, Stephan, Chow, Weng, & Schneider, Hans. MidInfrared QuantumDot Quantum Cascade Laser: A Theoretical Feasibility Study. United States. doi:10.3390/photonics3020029.
Michael, Stephan, Chow, Weng, and Schneider, Hans. 2016.
"MidInfrared QuantumDot Quantum Cascade Laser: A Theoretical Feasibility Study". United States.
doi:10.3390/photonics3020029. https://www.osti.gov/servlets/purl/1257807.
@article{osti_1257807,
title = {MidInfrared QuantumDot Quantum Cascade Laser: A Theoretical Feasibility Study},
author = {Michael, Stephan and Chow, Weng and Schneider, Hans},
abstractNote = {In the framework of a microscopic model for intersubband gain from electrically pumped quantumdot structures we investigate electrically pumped quantumdots as active material for a midinfrared quantum cascade laser. Our previous calculations have indicated that these structures could operate with reduced threshold current densities while also achieving a modal gain comparable to that of quantum well active materials. We study the influence of two important quantumdot material parameters, here, namely inhomogeneous broadening and quantumdot sheet density, on the performance of a proposed quantum cascade laser design. In terms of achieving a positive modal net gain, a high quantumdot density can compensate for moderately high inhomogeneous broadening, but at a cost of increased threshold current density. By minimizing quantumdot density with presently achievable inhomogeneous broadening and total losses, significantly lower threshold densities than those reported in quantumwell quantumcascade lasers are predicted by our theory.},
doi = {10.3390/photonics3020029},
journal = {Photonics},
number = 2,
volume = 3,
place = {United States},
year = {2016},
month = {5}
}